These 1000x super bonus, can they be get on normal spin?
AFAIK, it can't be triggered by normal spin. Three or more scatters triggered during normal spin can only activate the usual or normal bonus features. More scatters only affect how many spins you get.
playing horse racing RTP. It's also pure luck, just betting based on % RTP information on the house from tips game.
Is it provably fair? I've seen the game on the YouTube documentary in the Philippines IIRC.